Forces and Motion

Created by

Yasmin Beheiry

Cards (55)

In a distance time graph what is on the x-axis? 
Time.
In a distance time graph what is on the y-axis? 
Distance.
In a distance time graph speed is represented by?
Speed is represented by the gradient.
How do you calculate speed?
speed = distance/time
How do you calculate average speed?
average speed = total distance moved / total time taken
What is acceleration?
The rate of change of velocity.
How do you calculate acceleration? 
a = ( v - u) /t
what is the unit for acceleration?
m/s 2
What is velocity?
The speed of an object in a particular direction.
What is the unit for velocity?
m/s
How do you find the distance travelled from a velocity time graph?
The area under the graph.
In a velocity time graph what is on the x-axis? 
Time
In a velocity time graph what is on the y-axis? 
Velocity
What is uniform acceleration?
It is constant acceleration.
How do you calculate uniform acceleration?
v2 = u2 + 2as
How can a force affect an object?
It can cause changes in:
- speed
- direction
- shape
What is a force? 
a push or pull.
What is thrust?
a type of pushing force eg the thrust of rocket motors.
What is a scalar quantity? 
A quantity that has magnitude but no direction such as speed.
What is a vector quantity?
A quantity that has magnitude and direction such as velocity.
What is weight? 
the force of gravity acting on an object.
What is mass? 
the amount of matter in an object.
What is speed? 
the distance travelled per unit time.
What is resultant force?
The total effect of two or more forces acting on an object.
What is friction?
force that opposes the motion of an object.
How do you calculate resultant force?
F = ma
What is Newtons second law of motion?
F = ma
How do you calculate weight? 
W=mg
What is the unit for g, Gravitational field strength? 
Newtons per kilogram (N/kg)
What is stopping distance? 
The total distance travelled during the time it takes to stop a vehicle in an emergency.
How do you calculate stopping distance?
Stopping distance = Thinking distance + braking distance
what is stopping distance?
the total distance travelled during the time it takes for vehicle to stop in an emergency.
What is thinking distance? 
total distance travelled during the time it takes the driver to react to an emergency and stop the vehicle
What is braking distance?
the total distance travelled under the braking force.
how do you calculate stopping distance?
stopping distance = thinking distance + braking distance
What factors affect thinking distance? 
speed of the vehicle
reaction time of the driver
what factors affect reaction time?
being distracted
being intoxicated
being tired
What factors affect braking distance?
road conditions
tyre conditions
speed of the vehicle
what factors affect stopping distance?
speed of the vehicle
mass of the vehicle
road conditions
drivers reaction time
What is terminal velocity?
the maximum speed that a moving object is able to reacch